The first crossover fanfiction and last game in the original Batman: Arkham Trilogy, Phineas Flynn, or Batphin, works as hard as possible to release Dr. Crane's grip on Gotham City. T for slight use of language.

Two worlds meet for the first time. Three freinds are separated, on three different sides of the battle lines, in Gotham City. Phineas' sanity hangs in the balance. Isabella is finally brave enough to make a move on him, with the help of a new friend. And Ferb finds someone who talks almost as little as he does? Romance later on. Rated T for for possible disturbing elements.